Fluorescent Glass Ceramics And Glasses With Europium Content

Patent metadata

Field	Value
Publication number	US-2022204383-A1
Application number	US-202217694741-A
Country	US
Kind code	A1
Filing date	Mar 15, 2022
Priority date	Feb 14, 2019
Publication date	Jun 30, 2022
Grant date	—

Abstract

The invention relates to glass ceramics and glasses with a europium content, containing the following components:

Component
wt.-%

SiO 2
30.0 to 75.0

Al 2 O 3
10.0 to 45.0

Europium, calculated as Eu 2 O 3
0.05 to 5.0

and which are suitable in particular for the production of dental restorations, the fluorescence properties of which largely correspond to those of natural teeth.

First claim

1 . Glass or glass ceramic with europium content, which comprise the following components:

Component
wt.-%

SiO 2
30.0 to 75.0

Al 2 O 3
10.0 to 45.0

Europium, calculated as Eu 2 O 3
0.05 to 5.0.

2 . Glass or glass ceramic according to claim 1 , which comprise 32.0 to 72.0 wt.-% SiO 2 .

3 . Glass or glass ceramic according to claim 1 , which comprise 15.0 to 40.0 wt.-% Al 2 O 3 .

4 . Glass or glass ceramic according to claim 1 , which comprise 0.1 to 4.0 wt.-% europium, calculated as Eu 2 O 3 .

5 . Glass or glass ceramic according to claim 1 , which comprise 8.0 to 30.0 wt.-% Me II O wherein Me II O is selected from MgO, CaO, SrO and/or ZnO.

6 . Glass or glass ceramic according to claim 1 , which comprise 8.0 to 30.0 wt.-% CaO and/or SrO.

7 . Glass or glass ceramic according to claim 1 , which comprise at least one of the following components in the specified amounts:

Component
wt.-%

MgO
0 to 13.0

CaO
0 to 22.0

SrO
0 to 28.0

ZnO
0 to 5.0.

8 . Glass or glass ceramic according to claim 1 , which comprise 0 to 10.0 wt.-% BaO.

9 . Glass or glass ceramic according to claim 1 , which comprise 0 to 2.0 wt.-% tin, calculated as SnO.

10 . Glass or glass ceramic according to claim 1 , which comprise 0 to 5.0 wt.-% cerium, calculated as CeO 2 .

11 . Glass or glass ceramic according to claim 1 , containing 0 to 3.0 wt.-% B 2 O 3 .

12 . Glass or glass ceramic according to claim 1 , which comprise at least one of the following components in the specified amounts:

Component
wt.-%

SiO 2
32.0 to 72.0

Al 2 O 3
15.0 to 40.0

Europium, calculated as Eu 2 O 3
0.1 to 4.0

Cerium, calculated as CeO 2
0 to 5.0

Tin, calculated as SnO
0 to 2.0

Me I 2 O
0 to 15.0

Me II O
0 to 30.0

Me III 2 O 3
0 to 10.0

Me IV O 2
0 to 15.0

Me V 2 O 5
0 to 6.0

Me VI O 3
0 to 6.0

Fluorine
0 to 5.0,

wherein
Me I 2 O is selected from Li 2 O, Na 2 O, K 2 O, Rb 2 O and/or Cs 2 O,
Me II O is selected from MgO, CaO, SrO and/or Zno,
Me III 2 O 3 is selected from Y 2 O 3 , La 2 O 3 , Ga 2 O 3 and/or In 2 O 3 ,
Me IV O 2 is selected from ZrO 2 and/or GeO 2 ,
Me V 2 O 5 is selected from P 2 O 5 , V 2 O 5 , Ta 2 O 5 and/or Nb 2 O 5 and
Me VI O 3 is selected from WO 3 and/or MoO 3 .

13 . Glass ceramic according to claim 1 , which comprises at least one aluminosilicate as crystal phase.

14 . Glass ceramic according to claim 1 , which comprises at least 5 wt.-% aluminosilicate as crystal phase.

15 . Glass according to claim 1 , which comprises nuclei for the crystallization of an aluminosilicate.

16 . Glass or glass ceramic, which comprise the glass or the glass ceramic with europium content according to claim 1 .

17 . Glass or glass ceramic according to claim 1 , wherein the glass and the glass ceramic are present in the form of a powder, a granulate, a blank or a dental restoration.

18 . Glass or glass ceramic according to claim 1 , which exhibit fluorescence at an excitation wavelength in the range of from 250 nm to 430 nm.

Assignees

• Ivoclar Vivadent Ag

Inventors

• Dittmer Marc
• Hengst Ronny
• Ritzberger Christian

Classifications

• C03C4/0021

  for dental use · CPC title

• C03C10/0045

  containing SiO2, Al2O3 and MgO as main constituents · CPC title

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• C03C3/062

  with less than 40% silica by weight · CPC title

• C03C3/085 Primary

  containing an oxide of a divalent metal · CPC title